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Fig. 1. Schematic diagram showing the atonia-related regions in the pons (A) and medulla (B). Data are summarized from 28 rats and reconstructed according to Paxinos and Watson (1986). Stimulation was performed on both sides of the pons and medulla. , sites at which electrical stimulation produced bilateral inhibition of muscle tone. , sites at which stimulation produced contralateral inhibition with no effect on ipsilateral muscle tone. The size of symbols represents the potency of the effect. , , 50%; , : <50%. A and P indicate anterior and posterior to the interaural level, respectively. AQ, aqueduct; CG, central gray; CNF, nucleus cuneiformis; IC, inferior colliculus; P, pyramidal tract; RT, nucleus reticularis tegmenti; SCP, superior cerebellar peduncle; 5M, trigeminal motor nucleus; 5SP, spinal trigeminal tract; 7, facial nucleus.

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